6.12-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Richter tmricht@linux.ibm.com
[ Upstream commit f55bd479d8663a4a4e403b3d308d3d1aa33d92df ]
Reservation of the PMU hardware is done at first event creation and is protected by a pair of mutex_lock() and mutex_unlock(). After reservation of the PMU hardware the memory required for the PMUs the event is to be installed on is allocated by allocate_buffers() and alloc_sampling_buffer(). This done outside of the mutex protection. Without mutex protection two or more concurrent invocations of perf_event_init() may run in parallel. This can lead to allocation of Sample Data Blocks (SDBs) multiple times for the same PMU. Prevent this and protect memory allocation of SDBs by mutex.
Fixes: 8a6fe8f21ec4 ("s390/cpum_sf: Use refcount_t instead of atomic_t") Signed-off-by: Thomas Richter tmricht@linux.ibm.com Reviewed-by: Sumanth Korikkar sumanthk@linux.ibm.com Reviewed-by: Hendrik Brueckner brueckner@linux.ibm.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kernel/perf_cpum_sf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index 5b765e3ccf0ca..3317f4878eaa7 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -759,7 +759,6 @@ static int __hw_perf_event_init(struct perf_event *event) reserve_pmc_hardware(); refcount_set(&num_events, 1); } - mutex_unlock(&pmc_reserve_mutex); event->destroy = hw_perf_event_destroy;
/* Access per-CPU sampling information (query sampling info) */ @@ -848,6 +847,7 @@ static int __hw_perf_event_init(struct perf_event *event) if (is_default_overflow_handler(event)) event->overflow_handler = cpumsf_output_event_pid; out: + mutex_unlock(&pmc_reserve_mutex); return err; }